KR20070010767A - Combined power plant hrsg corrosion protection system - Google Patents

Combined power plant hrsg corrosion protection system Download PDF

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KR20070010767A
KR20070010767A KR1020050065637A KR20050065637A KR20070010767A KR 20070010767 A KR20070010767 A KR 20070010767A KR 1020050065637 A KR1020050065637 A KR 1020050065637A KR 20050065637 A KR20050065637 A KR 20050065637A KR 20070010767 A KR20070010767 A KR 20070010767A
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corrosion
dry air
air supply
sensor
hrsg
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KR1020050065637A
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Korean (ko)
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KR100707780B1 (en
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장석원
주용진
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한국전력공사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
    • F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/12—Heat utilisation in combustion or incineration of waste

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

A combined power plant HRSG(Heat Recovery Steam Generator) corrosion protection system is provided to prevent corrosion of the power plant HRSG by monitoring corrosion of an outer surface of a finned tube and operating a dry air supply unit. A combined power plant HRSG corrosion protection system comprises a corrosion sensor(110), a dry air supply unit(500), a humidity sensor, a corrosion monitor(400), and a communication card(600). The corrosion sensor is arranged in the HRSG, and measures the degree of corrosion in the HRSG and variation of corrosion signals by sensing corrosion current and corrosion electrical potential signals, and outputs a signal in accordance with the result of the measurement. The dry air supply unit supplies dry air to the HRSG in accordance with an input control signal. The humidity sensor measures the relative humidity in the HRSG, and outputs a dry state signal when the dry air supply unit operates. The corrosion monitor is arranged to monitor the degree of corrosion by recording the signal input from the corrosion sensor and displaying converted signal onto a display(420), control the early operation of the dry air supply unit, and change operating state of the dry air supply unit by monitoring the variation of relative humidity resulting from the dry air supply. The communication card transmits signals output from the corrosion sensor to the corrosion monitor and the dry air supply unit.

Description

복합화력 배열회수 보일러(ＨＲＳＧ)의 부식방지시스템{Combined Power Plant HRSG Corrosion Protection System}Combined Power Plant HRSG Corrosion Protection System

도 1은 일반적인 배열회수보일러의 구성을 나타낸 개략도,1 is a schematic view showing the configuration of a general heat recovery boiler;

도 2는 본 발명에 따른 복합화력 배열회수보일러의 부식방지시스템을 설명하기 위한 블록도이다.2 is a block diagram illustrating a corrosion prevention system of a combined cycle heat recovery boiler according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of Symbols for Main Parts of Drawings>

100 : 배열회수보일러100: array recovery boiler

110 : 부신센서110: adrenal sensor

120 : 습도센서120: humidity sensor

400 : 부식모니터링장치400: corrosion monitoring device

410 : 범용컴퓨터410: general purpose computer

420 : 표시화면420: display screen

430 : 프린터 430: Printer

500 : 건공기공급장치500: dry air supply device

600 : 통신카드600: communication card

본 발명은 배열회수보일러(HRSG)의 부식방지시스템에 관한 것으로서, 더욱 상세하게는 복합화력발전에 사용되는 배열회수보일러가 가동정지기간 동안 내부 온도와 습기에 의해 핀 튜브(Finned Tube) 외면에 부식이 발생하는 것을 방지할 수 있도록 한 부식방지시스템에 관한 것이다.The present invention relates to a corrosion prevention system of a heat recovery boiler (HRSG), and more particularly, the heat recovery boiler used in the combined cycle power generation is corroded to the outer surface of the finned tube by the internal temperature and moisture during the operation stop period. It relates to a corrosion protection system that can prevent this from happening.

현재 아파트 등 대규모 밀집 주거지역에 위치하여 열 공급원으로 가동중에 있는 복합화력발전소는 통상 도 1에 도시한 바와 같이 가스터빈(200)과, 고압증발기(100a), 중압증발기(100b), 저압증발기(100c)가 형성된 배열회수보일러(100)와, 증기터빈(300)을 포함하여 구성된다. 그 발전방식은 가스터빈(200)을 운전하여 1차 발전을 한 후 배출된 620℃ 가량의 고온의 배기가스를 배열회수보일로(100)에서 회수, 이 열을 이용하여 증기터빈(300) 발전에 적합한 증기를 생산 발전함으로써 열효율 높이는 방식으로 이때 열회수를 하기 위하여 배열회수보일러(100)에서는 수천개의 핀 튜브가 사용된다.Currently, a combined cycle power plant located in a large dense residential area such as an apartment and operating as a heat source is typically a gas turbine 200, a high pressure evaporator 100a, a medium pressure evaporator 100b, and a low pressure evaporator as shown in FIG. It is configured to include a heat recovery boiler 100 and a steam turbine 300 is formed 100c. The power generation method is to recover the high-temperature exhaust gas of about 620 ℃ discharged after the first power generation by operating the gas turbine 200 in the heat recovery boiler 100, the steam turbine 300 power generation using this heat Thousands of fin tubes are used in the heat recovery boiler 100 in order to recover heat in such a way that the heat efficiency is improved by producing steam suitable for the heat recovery.

이러한 복합화력 발전소는 전력부하의 증감에 신속하게 대응하기 위하여 하절기 및 동절기의 전력공급의 변화로 장단기에 걸친 발전정지가 불가피하다. 특히 복합화력 발전의 운용 특성상 단기 정기가 가장 빈번하게 발생하는데 이때 발전 설비에 부식현상이 발생하게 된다. In order to respond quickly to increase and decrease of power load, the combined cycle power plant is inevitable in the short and long term due to the change of power supply in summer and winter. In particular, short-term periodic occurrence occurs most frequently due to the operation characteristics of combined cycle power generation, and corrosion occurs in power generation facilities.

정지시 부식이 가장 심한 설비는 배열회수보일러(100)로서 연소가스를 가열하는 표면인 핀 튜브 외면이 온도저하 및 외부 습기의 유입에 의하여 전체적으로 부식하게 된다. 핀 튜브 표면에 발생 된 녹은 핀 사이의 공간을 막아 열전도율을 저하시켜 열흡수율이 감소하게 되어 결국 배열회수보일러(100)의 효율이 저하되며 수명을 단축시키게 된다.The most severe equipment at the time of stop is the heat recovery boiler 100, the outer surface of the fin tube, which is the surface for heating the combustion gas is corroded by the temperature drop and the inflow of external moisture as a whole. Blocking the space between the molten fin generated on the surface of the fin tube lowers the thermal conductivity to reduce the heat absorption, eventually reducing the efficiency of the array recovery boiler 100 and shorten the life.

따라서 이러한 부식을 방지하기 위한 수단으로서, 정기기간 동안 핀 튜브 내면은 순수와 약품처리를 통해 습식보존 하고, 외면은 잠열이나 열풍기 등의 열공급장치를 이용하여 내부 온도를 유지하는 방법, 외부공기의 먼지와 수분을 제거하는 필터를 공기 유입부에 설치하여 제한적인 부식진행 억제하는 방법, 또는 외부공기의 유입을 막기 위해서 굴뚝에 댐퍼를 설치하여 빗물유입이나 외부공기 유입 등의 외부의 수분 또는 부식인자들의 유입을 차단하는 방법 등의 제한적인 부식방지책이 실시되고 있다.Therefore, as a means to prevent such corrosion, the inner surface of the fin tube is wet preserved through pure water and chemical treatment during the regular period, the outer surface is maintained by using a heat supply device such as latent heat or hot air, the outside air dust And a filter that removes water and moisture to prevent limited corrosion progress, or by installing a damper on the chimney to prevent the inflow of external air. Limited corrosion protection measures, such as blocking inflow, have been implemented.

그러나 정기기간이 길어지면 외부로부터의 수분 유입은 불가피한 상황이고 필터의 처리용량과 성능 또한 한계가 있기 때문에 효과적으로 부식을 방지할 수 없다.However, when the period is long, inflow of water from the outside is inevitable, and the capacity and performance of the filter are limited, so that corrosion cannot be effectively prevented.

또한 부식 정도를 항상 모니터링 하는 장치가 없기 때문에 부식진행 정도에 관계없이 일률적으로 부식방지 설비를 운영함으로써 비용증가와 성능저하를 초래하고 있다.In addition, since there is no device to monitor the degree of corrosion at all times, the operation of corrosion prevention equipment is operated uniformly regardless of the degree of corrosion, resulting in cost increase and performance deterioration.

이와 같은 문제점을 해결하기 위하여 본 발명에서는 복합화력발전소 정지시 설비를 효과적인 보전하기 위한 대책의 일환으로써, 부식에 취약한 배열회수보일러 노(furnace) 내부의 부식 정도를 상시 점검하고 필요시 건조공기(dry air)를 공급 함으로써 설비의 최적성능을 유지하여 성능열화를 최소화하고 설비의 신속한 재가동이 가능하도록 하는 시스템을 제공하는데 그 목적이 있다.In order to solve such a problem, the present invention, as part of the measures to effectively maintain the facilities when the combined cycle power plant is stopped, always checks the degree of corrosion in the heat recovery boiler furnace vulnerable to corrosion, and if necessary dry air (dry) The purpose of the present invention is to provide a system for minimizing performance deterioration and enabling rapid restart of the facility by maintaining the optimum performance of the facility by supplying air).

상기와 같은 목적을 달성하기 위한 본 발명에 따른 배열회수보일러의 부식방지 시스템은 배열회수보일러 내부에 설치되어 부식전류 및 부식전위 신호를 감지함으로써 배열회수보일러 내부의 부식진행 정도와 부식신호의 변화를 측정하고 그 결과신호를 출력하는 부식센서와, 부식센서가 출력한 결과신호에 근거하여 입력되는 제어신호에 따라 배열회수보일러 내부에 건조공기를 공급하는 건공기공급장치와, 건공기공급장치가 작동되면 배열회수보일러 내부의 상대습도를 측정하여 건조상태를 출력하는 습도센서와, 부식센서에서 입력받은 결과신호를 기록하고 사용자 인식할 수 있도록 신호변환하여 표시화면에 출력함으로써 부식진행 여부를 감시하고 부식 정도를 판단하여 상기 건공기공급장치의 구동을 제어하는 부식모니터링장치와, 부식센서가 출력한 결과신호를 부식모니터링장치와 건공기공급장치에 전송하는 통신카드를 포함하여 구성된다.Corrosion prevention system of the heat recovery boiler according to the present invention for achieving the above object is installed inside the heat recovery boiler to detect the corrosion current and corrosion potential signal to change the degree of corrosion progress and corrosion signal inside the heat recovery boiler. Corrosion sensor for measuring and outputting the result signal, dry air supply device for supplying dry air inside the heat recovery boiler according to the control signal input based on the result signal output by the corrosion sensor, and dry air supply device The humidity sensor outputs the dry state by measuring the relative humidity inside the array recovery boiler, and records the result signal received from the corrosion sensor and converts the signal so that it can be recognized by the user. Corrosion monitoring device for controlling the driving of the dry air supply device by determining the degree, It is a result of the corrosion monitoring signal output device and the gun is configured to include a communication card for sending to the air supply.

이하, 첨부한 도면을 참고로 하여 본 발명에 따른 복합화력 배열회수보일러 부식방지 시스템을 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the combined cycle heat recovery boiler corrosion prevention system according to the present invention.

도 2는 본 발명에 따른 복합화력 배열회수보일러의 부식방지 시스템의 구성을 나타낸 블록도이다.Figure 2 is a block diagram showing the configuration of the corrosion prevention system of the combined cycle heat recovery boiler according to the present invention.

도시한 바와 같이, 배열회수보일러(100)는 부식센서(110)와 습도센서(120)가 내부에 장착되어 있고, 통신카드(600)를 통해 건공기공급장치(500) 및 부식모니터링장치(400)와 연결되어 있다.As shown, the heat recovery boiler 100 has a corrosion sensor 110 and the humidity sensor 120 is mounted therein, the dry air supply device 500 and the corrosion monitoring device 400 through the communication card 600 )

우선, 배열회수보일러(100) 내부에 설치되는 부식센서(110)는 분석하고자 하는 금속이온의 전기화학적 반응이 일어나는 작업전극(working electrode)과 전류의 흐름을 원활히 하기 위한 상대전극(counter electrode)을 포함하여 구성된다.First, the corrosion sensor 110 installed inside the array recovery boiler 100 has a working electrode where an electrochemical reaction of a metal ion to be analyzed occurs and a counter electrode for smoothly flowing current. It is configured to include.

일반적으로 부식을 감지하는 방법에는 음향을 반사시킨 후에 어레이 센서(array sensor)와 다채널 감지장치를 이용하여 음향을 수신하고 이를 분석처리함으로써 금속의 균열 및 이상 지점을 찾아내는 음향반사법, 금속의 부식으로 인해 줄어든 금속의 두께 변화를 감지하여 부식유무를 체크하는 초음파법, 전도성 유동체내에 시험용 탐침을 삽입시켜 선형 분극을 측정함으로써 순간적인 부식율을 알아내는 순시 부식율 측정법, 장시간 동안 부식으로 인한 저항변화를 감지함으로써 부식율을 알아내는 저항측정법, 전해질내의 금속표면에서 금속의 전기화학적 전위를 측정하여 부식진행 유무를 판단하는 전기화학적 전위측정법 등이 있으며, 근래 들어 가장 많이 사용되는 방법은 전기화학적 전위측정법이다. In general, a method of detecting corrosion includes acoustic reflection, which finds a crack and an abnormal point of a metal by reflecting sound and then receiving and analyzing the sound using an array sensor and a multi-channel sensing device. Ultrasonic method that detects the change of metal thickness due to the reduction of corrosion and checks for corrosion, Instantaneous corrosion rate measurement method to find instantaneous corrosion rate by inserting test probe into conductive fluid and measuring linear polarization, Resistance change due to corrosion for a long time Resistance measurement method to detect the corrosion rate by detecting the; and electrochemical potential measurement method to determine the corrosion progress by measuring the electrochemical potential of the metal on the metal surface in the electrolyte, and the most commonly used method is the electrochemical potential measurement method to be.

본 발명의 부식센서(110)는 전기화학적 전위측정 방식으로 부식을 측정하며 작업전극으로 탄소강 시편을 사용하고 상대전극으로는 구리판을 사용한다.The corrosion sensor 110 of the present invention measures the corrosion by an electrochemical potential measurement method, using a carbon steel specimen as a working electrode and a copper plate as a counter electrode.

상기 부식센서(110)는 배열회수보일러(100) 내부의 부식분위기를 감지하여 부식전위를 발생시키고 부식전위 신호를 출력함으로써 후술할 건공기공급장치(500)의 작동 기준으로 사용된다.The corrosion sensor 110 is used as a reference for the operation of the dry air supply device 500 to be described later by generating a corrosion potential by detecting the corrosion atmosphere inside the heat recovery boiler 100 and outputs a corrosion potential signal.

건공기공급장치(500)는 상기 부식센서(110)가 출력한 결과신호에 근거하여 입력되는 제어신호에 따라 건조공기를 생성하고 이를 상기 배열회수보일러(100)에 공급하게 된다. 상기 건공기공급장치(500)는 가열기를 포함하는 열회수장치를 사용하여 외부공기 중의 수분을 제거함으로써 건조공기를 생성하게 된다.The dry air supply device 500 generates dry air according to a control signal input based on the result signal output by the corrosion sensor 110, and supplies the dry air to the array recovery boiler 100. The dry air supply device 500 generates dry air by removing moisture in external air using a heat recovery device including a heater.

상기 부식센서(110)와 함께 상기 배열회수보일러(100) 내부에 설치된 습도센서(120)는 상기 부식센서(110)의 출력신호에 근거하여 건공기공급장치(500)가 작동하는 경우 상기 건공기공급장치(500)의 제습작용에 따라 변화되는 상기 배열회수보일러(100) 내부의 상대습도를 측정하고 그 결과치를 상기 건공기공급장치(500)로 출력하여 건조공기 공급량에 따라 변화되는 습도량을 측정함으로써 상기 부식센서(110)와 함께 건공기공급장치(500)의 운전상태 조절을 위한 판단기준을 제공한다. 즉 상대습도는 부식과 밀접한 관계가 있으므로 건조 공기의 공급에 의한 부식감소효과를 측정하는 부식센서(110)와 더불어 습도센서(120)가 배열회수보일러(100) 내부의 부식 분위기 조성의 주요 인자인 습도를 측정하게 된다.The humidity sensor 120 installed inside the heat recovery boiler 100 together with the corrosion sensor 110 is operated when the dry air supply device 500 operates based on an output signal of the corrosion sensor 110. Measure the relative humidity in the heat recovery boiler 100 changes according to the dehumidification action of the supply device 500 and outputs the result to the dry air supply device 500 to determine the amount of humidity that changes according to the dry air supply amount. The measurement provides a criterion for controlling the operating state of the dry air supply device 500 together with the corrosion sensor 110. That is, since relative humidity is closely related to corrosion, the humidity sensor 120 together with the corrosion sensor 110 for measuring the corrosion reduction effect by the supply of dry air is a major factor in the composition of the corrosion atmosphere inside the heat recovery boiler 100. Humidity is measured.

상기 부식센서(110)가 출력한 결과신호를 입력받는 부식모니터링장치(400)는범용컴퓨터(410), 표시화면(420), 및 프린터(430)를 포함하여 구성되며 상기 결과신호를 기록하고 사용자가 인지할 수 있는 형태로 신호전환하여 표시화면(420)상에 출력한다. 사용자는 표시화면(420)에 0 내지 10Ｖ 의 전압신호 형태로 표시된 배열회수보일러(100) 내부의 부식 정도에 근거하여 제습이 필요한 경우 상기 건공기공급장치(500)의 작동 개시를 제어하게 된다. Corrosion monitoring device 400 receives the result signal output from the corrosion sensor 110 comprises a general-purpose computer 410, a display screen 420, and a printer 430, and records the result signal and the user The signal is converted into a form that can be recognized and output on the display screen 420. The user controls the start of operation of the dry air supply device 500 when dehumidification is required based on the degree of corrosion inside the array recovery boiler 100 displayed in the form of a voltage signal of 0 to 10 Hz on the display screen 420.

또한 부식모니터링장치(400)는 상기 건공기공급장치(500)가 작동하는 동안 상기 습도센서가 출력하여 건공기공급장치(500)에 기록된 상대습도를 감시하여 상 기 건공기공급장치(400)의 건조공기량 공급을 제어하게 된다. In addition, the corrosion monitoring device 400 monitors the relative humidity recorded in the dry air supply device 500 by outputting the humidity sensor while the dry air supply device 500 is operating, and the dry air supply device 400. To control the supply of dry air.

마지막으로 상기 부식센서(110)의 신호를 입력받아 상기 부식모니터링장치(400)와 상기 건공기공급장치(500)로 출력하는 데이터 통신수단인 통신카드(600)는 상기 부식센서(110)가 발생한 전류 또는 전위를 부식 정도에 비례하는 전압으로 출력하게 된다.Finally, the corrosion sensor 110 generates a communication card 600 which receives the signal from the corrosion sensor 110 and outputs the data to the corrosion monitoring device 400 and the dry air supply device 500. The current or potential is output at a voltage proportional to the degree of corrosion.

상기와 같이 구성된 복합화력 배열회수보일러의 부식방지 시스템에 있어서 부식을 제어하는 실시예에 대하여 설명하면 다음과 같다. Referring to the embodiment for controlling the corrosion in the corrosion prevention system of the combined cycle heat recovery boiler configured as described above are as follows.

복합화력 발전소의 설비가 가동을 중지하고 있는 동안 배열회수보일러(100) 내부에 설치된 부식센서(110)에서 감지된 습도변화에 따른 부식 전류 및 전위변화 신호가 통신카드(600)에서 전압신호로 변환된다. 상기 전압신호는 0Ｖ에서 최대 10Ｖ 사이이며, 감지된 부식 정도가 클수록 전압의 크기도 비례하여 커지게 된다. 상기 통신카드(600)에서 전압의 형태로 변환된 부식신호는 부식모니터링장치(400)에서 사용자가 인식할 수 있는 형태로 변환되어 표시화면(420)에 출력된다. 사용자는 전압의 크기로 표현되는 부식신호 결과치에 근거하여 제습이 필요하다고 판단되면 상기 부식모니터링장치(400)로부터 제어신호를 출력하여 건공기공급장치(500)의 운전을 개시하고 건조공기를 생성하여 생성된 건조공기를 배열회수보일러(100)에 공급하도록 한다. While the equipment of the combined cycle power plant is in operation, the corrosion current and potential change signal according to the humidity change detected by the corrosion sensor 110 installed inside the heat recovery boiler 100 is converted into a voltage signal in the communication card 600. do. The voltage signal is between 0 kV and 10 kV, and the greater the degree of detected corrosion, the greater the magnitude of the voltage. The corrosion signal converted in the form of voltage in the communication card 600 is converted into a form that can be recognized by the user in the corrosion monitoring device 400 is output to the display screen 420. When the user determines that dehumidification is necessary based on the corrosion signal result value expressed as the magnitude of the voltage, the user outputs a control signal from the corrosion monitoring device 400 to start the operation of the dry air supply device 500 and generate dry air. The generated dry air is supplied to the heat recovery boiler 100.

한편, 습도센서(120)는 건조공기가 공급되는 동안 변화되는 배열회수보일러(100) 내부의 상대습도를 측정하여 건공기공급장치(500)에 전송하고 부식모니터링장치(400)에서는 습도 변화를 모니터링하면서 건공기공급장치(500)의 운전상태를 조절하여 적정한 내부 습도를 달성하게 된다.On the other hand, the humidity sensor 120 measures the relative humidity inside the array recovery boiler 100 that is changed while the dry air is supplied to the dry air supply device 500 and monitor the humidity change in the corrosion monitoring device 400 While adjusting the operating state of the dry air supply device 500 to achieve an appropriate internal humidity.

배열회수보일러 내부, 특히 핀 튜브 외면의 부식 진행을 상시 감시하고 부식상태를 확인하여 건공기공급장치를 작동하고 공급시간을 조절함으로써 최소한의 비용으로 최적의 부식방지 분위기를 조성하여 부식에 의한 사고를 미연에 방지할 수 있고, 경제적인 방법으로 배열회수보일러를 유지하게 되어 복합화력 발전설비의 운전효율을 향상시키는 효과를 달성할 수 있다.Always monitor the progress of corrosion inside the heat recovery boiler, especially the outer surface of the fin tube, check the corrosion status, operate the dry air supply system, and adjust the supply time to create an optimal corrosion protection atmosphere with minimal cost. It is possible to prevent in advance, and to maintain the heat recovery boiler in an economical manner can achieve the effect of improving the operating efficiency of the combined cycle power plant.

Claims (6)

배열회수보일러 내부에 설치되어 부식전류 및 부식전위 신호를 감지함으로써 배열회수보일러 내부의 부식진행 정도와 부식신호의 변화를 측정하고 결과신호를 출력하는 부식센서와, Corrosion sensor installed inside the array recovery boiler to detect the corrosion current and corrosion potential signal, to measure the progress of corrosion and the change of the corrosion signal inside the array recovery boiler, and to output the result signal; 상기 부식센서가 출력한 결과신호에 근거하여 입력되는 제어신호에 따라 배열회수보일러 내부에 건조공기를 공급하는 건공기공급장치와,A dry air supply device for supplying dry air into the heat recovery boiler according to a control signal input based on a result signal output by the corrosion sensor; 상기 건공기공급장치가 작동되면 상기 배열회수보일러 내부의 상대습도를 측정하여 건조상태를 출력하는 습도센서와, A humidity sensor for outputting a dry state by measuring a relative humidity inside the heat recovery boiler when the dry air supply device is operated; 상기 부식센서에서 입력받은 결과신호를 기록하고 사용자 인식할 수 있도록 신호변환하여 표시화면에 출력함으로써 부식진행 여부를 감시하고 부식 정도를 판단하여 상기 건공기공급장치의 초기작동을 제어하며 건조공기 공급에 의한 상대습도의 변화를 모니터링하여 건공기공급장치의 운전상태를 변경하는 부식모니터링장치와,By recording the result signal received from the corrosion sensor and converting the signal to be recognized by the user and outputting it on the display screen, it monitors the progress of corrosion and judges the degree of corrosion to control the initial operation of the dry air supply device and to supply dry air. Corrosion monitoring device for changing the operating state of the dry air supply device by monitoring the change in relative humidity caused by 상기 부식센서가 출력한 결과신호를 상기 부식모니터링장치와 상기 건공기 공급장치에 전송하는 통신카드를 포함하여 이루어지는 것을 특징으로 하는 복합화력 배열회수보일러의 부식방지시스템.And a communication card for transmitting a result signal output from the corrosion sensor to the corrosion monitoring device and the dry air supply device. 제 1항에 있어서, 상기 통신카드는 상기 부식센서가 감지한 전류 또는 전위신호를 부식단계 별로 0 내지 10Ｖ사이의 전압신호로 변환하여 상기 모니터링장치 와 상기 건공기공급장치에 출력하는 것을 특징으로 하는 복합화력 배열회수보일러의 부식방지시스템.The method of claim 1, wherein the communication card is characterized in that for converting the current or potential signal detected by the corrosion sensor into a voltage signal between 0 to 10 kV for each corrosion step and outputs to the monitoring device and the dry air supply device. Corrosion protection system of combined cycle heat recovery boiler. 제 2항에 있어서, 상기 부식센서의 측정방식은 전기화학적 전위측정법을 사용하는 것을 특징으로 하는 복합화력 배열회수보일러의 부식방지시스템.3. The corrosion prevention system of a combined cycle heat recovery boiler according to claim 2, wherein the measurement method of the corrosion sensor uses an electrochemical potential measurement method. 제 3항에 있어서, 상기 부식센서는 작업전극(working electrode)으로 탄소강 시편을 사용하고, 상대전극(counter electrode)으로 구리판을 사용하는 것을 특징으로 하는 복합화력 배열회수보일러의 부식방지시스템.4. The corrosion prevention system of claim 3, wherein the corrosion sensor uses a carbon steel specimen as a working electrode and a copper plate as a counter electrode. 제 1항에 있어서, 상기 건공기공급장치는 가열기를 포함하는 열회수장치로 이루어지는 것을 특징으로 하는 복합화력 배열회수보일러의 부식방지시스템.The corrosion prevention system of a combined cycle heat recovery boiler according to claim 1, wherein the dry air supply device comprises a heat recovery device including a heater. 제 1항에 있어서, 상기 부식모니터링장치는 범용컴퓨터, 표시장치, 그리고 프린터를 포함하여 이루어지는 것을 특징으로 하는 복합화력 배열회수보일러의 부식방지시스템.The corrosion preventing system of claim 1, wherein the corrosion monitoring device comprises a general-purpose computer, a display device, and a printer.
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